improve list command

added version spec ability for remove and fetch commands, deprecate --version argument for those

Added version spec ability for dub commands

Enforce proper package loading on 'dub update'. Fixes #1970.

Fix issue 1917 - Add dub dustmite --no-redirect

Make CommandLine's constructors '@safe pure nothrow'

Fix failing test on native Windows.

Fix #1040 - dub run <package>@x.y.z ignores the specified version

Merge pull request #1906 from gedaiu/master ...

Refactor and test the `runDubCommandLine` function
merged-on-behalf-of: Jan Jurzitza <gh@webfreak.org>

Lint: Add --report-file argument

Join unit tests

Add assert if extractRemainingArgs is called more than one time

Remove !is null from HelpCommand comparison ...

Co-Authored-By: Jan Jurzitza <gh@webfreak.org>

Documentation update

Rename command property to commandGroups

Use cast to check for the HelpCommand

docs and code style update

Remove array after joining the string list

Refactor CommandNameArgument to function

Add hasAppVersion method to CommandArgs

docs update

Move prepare command and dub setup to CommandLineHandler

Extract argument parsing code from runDubCommandLine to separate structs

fix #1556: dub --cache=local fetch + build ...

Building a package that was locally cached failed, because
the dependencies whould be fetched at the wrong destination.

For example if one tries to build the package 'optional':

$ dub --cache=local fetch optional
-> optional is now at ./.dub/package/optional
$ dub --cache=local build optional
-> fails because the dependency bolts was fetched to
./.dub/package/optional/.dub/package/bolts.

This is fixed by not overwriting the root path if dub builds
a package from the cache.

fix #1891: documentation of dub fetch

Fix issue 1277: Missing dub.json causes infinite loop ...

For some reason, having a 'source/app.d' was recognized as being in a package.
This would load an empty package with no manifest and send the dependency resolver
in an infinite loop.
Remove the special detection of 'source/app.d' and rely only on manifest.
Another option would have been to detect 'source/app.d' as a single-file package,
but that is a bit too much magic (the user can just 'dub run --single source/app.d').

remove version (Windows)

add flush before reading input

Fix unnecessary rebuild of single file package

Fix parsing version specifiers containing '='